diff options
| -rw-r--r-- | src/compiler/scala/reflect/internal/Chars.scala | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/src/compiler/scala/reflect/internal/Chars.scala b/src/compiler/scala/reflect/internal/Chars.scala index 7bd37618ed..f2c90a6721 100644 --- a/src/compiler/scala/reflect/internal/Chars.scala +++ b/src/compiler/scala/reflect/internal/Chars.scala @@ -21,27 +21,31 @@ trait Chars { final val SU = '\u001A' /** Convert a character digit to an Int according to given base, - * -1 if no success */ + * -1 if no success + */ def digit2int(ch: Char, base: Int): Int = { - if ('0' <= ch && ch <= '9' && ch < '0' + base) - ch - '0' - else if ('A' <= ch && ch < 'A' + base - 10) - ch - 'A' + 10 - else if ('a' <= ch && ch < 'a' + base - 10) - ch - 'a' + 10 - else - -1 + val num = ( + if (ch <= '9') ch - '0' + else if ('a' <= ch && ch <= 'z') ch - 'a' + 10 + else if ('A' <= ch && ch <= 'Z') ch - 'A' + 10 + else -1 + ) + if (0 <= num && num < base) num else -1 } + /** Buffer for creating '\ u XXXX' strings. */ + private[this] val char2uescapeArray = Array[Char]('\\', 'u', 0, 0, 0, 0) /** Convert a character to a backslash-u escape */ def char2uescape(c: Char): String = { - var rest = c.toInt - val buf = new StringBuilder - for (i <- 1 to 4) { - buf ++= (rest % 16).toHexString - rest = rest / 16 - } - "\\u" + buf.toString.reverse + @inline def hexChar(ch: Int): Char = + ( if (ch < 10) '0' else 'A' - 10 ) + ch toChar + + char2uescapeArray(2) = hexChar((c >> 12) ) + char2uescapeArray(3) = hexChar((c >> 8) % 16) + char2uescapeArray(4) = hexChar((c >> 4) % 16) + char2uescapeArray(5) = hexChar((c ) % 16) + + new String(char2uescapeArray) } /** Is character a line break? */ |